JPH0235351A - Apparatus for detecting defective insulator - Google Patents

Abstract

PURPOSE:To detect the defect of an insular positively and quickly by projecting laser light on the surface of the insulator so as to vibrate the insulator, converting the interference fringes of the reflected laser light caused by the vibration into an audible sound, and comparing the audible sound with a sound to be generated at the normal time. CONSTITUTION:Laser light is projected on the surface of an insulator 5 from a laser generator 12. The reflected light is made to pass through a slide glass 14. Meanwhile, reference light which is split through a beam splitter 13 is inputted into said slide glass 14 through a beam diffusing lens 16. Interference is generated between the reference light and said reflected light. The interference light is inputted into a photodetector 15. Laser light is projected on the surface of the insulator 5 from a pulse laser generator 11 so as to give mechanical shock, thereby, causing vibration. The interference fringes based on the vibration are detected with said photodetector 15. The detected signal from said photodetector 15 is converted to an audible sound through a sound converter 20, and the generated sound is outputted through a speaker 21. When the audible sound is compared with the produced sound from a normal insulator, the quality of the insulator is judged.

Description

[Detailed description of the invention] [Prior to industrial use] The present invention is capable of reliably, quickly and safely fixing a defective part such as a crank in the insulator body of a suspension insulator that supports a power transmission line, for example. This invention relates to a detection device that can detect defects.

[-Prior Art] Conventionally, as a detector for detecting a defective suspension insulator in a suspension 11-child chain for a power transmission line, a detector for detecting defective lead by measuring the shared voltage of each suspension insulator (a detector by the same applicant) has been proposed. Special Public Service 1977-
No. 3057) has been proposed.

This defective insulator detector is equipped with a pair of contact horns at the tip of the insulating rod that touch both the upper and lower ends of the suspended insulator, and discharges the gap in the detector according to the voltage shared by the nail, and determines whether the insulator is good or not by determining the blinking degree of the neon lamp. It is designed to make judgments.

In addition, the applicant has filed a patent application in 1983 as a method for detecting defective insulators.
-Proposed the detection method of No. 166471.

That is, a laser generator irradiates the insulator with a laser beam to apply a mechanical shock to cause the insulator to vibrate, and a laser transmitting/receiving device for detecting this vibration shines a vibration detection laser on the porcelain surface of the insulator! :L・I is reflected by the same porcelain face, this reflected laser is received by the laser transmitting/receiving device, this signal is frequency analyzed by a frequency analyzer, and the vibration mode of the normal insulator and the defective one are detected. A defective insulator is detected by comparing the vibration mode of the insulator.

[Problem to be Solved by the Invention 1] However, the former defective insulator detector requires climbing a steel tower to perform the work when determining the quality of a suspended insulator in use, which is highly dangerous and takes a long time. Since an insulating rod is used, the workability is poor and the efficiency of determining pass/fail is extremely low. Even if it is compared, a new problem will arise that it is difficult to judge whether it is good or bad. In other words, if a method based on frequency spectrum analysis is used to detect cracks in an insulator based on changes in vibration, it is difficult to detect the changes in the spectrum because they are only subtle differences with slight frequency shifts. Ta. Furthermore, to explain in detail, C0 is applied to normal insulators and defective insulators.
The output waveforms of the anti-acceleration vibration detector obtained in 1!1 and 11 after irradiation with 2 rays of light are shown in FIGS. 6 and 7. (The laser output at this time is approximately 2.7 J.) There is no noticeable difference between the two waveforms, and it is quite difficult to detect a defective insulator from the top of the rising waveform in spectrum analysis. It is.

An object of the present invention is to provide a failure detection device that can reliably and quickly determine whether a defective insulator is good or bad.

[Means for Solving the Problems] The present invention provides a laser generator for vibrating an insulator that mechanically vibrates the (iJ element) by irradiating the surface of the insulator with a laser beam in order to achieve the object of layering. A measurement laser generator that irradiates the surface of the insulator with a laser beam for detecting the vibration of the insulator, and a laser beam irradiated to the insulator from the measurement laser generator is reflected from the concave element to detect the object reflected light. a vibration detection device that detects the vibration of the insulator by interfering with a part of the irradiation light and detecting the vibration of the insulator from the interference light;
It consists of a 7-voice conversion device; d for converting to koji:1.

[Function] The present invention uses a 1゛? Since a voice conversion device is installed, the difference between a normal insulator and a defective insulator can be reliably and quickly determined by the difference in Tf voice.

[Example] My son embodied the present invention--Example is shown in Figure 1-1 No. 5
This will be explained based on the diagram.

As shown in FIG. 2, a suspended VJ sub-unit 4 that supports the power transmission line 3 is suspended from the support arm 2 of the steel tower 1. The suspended insulator 4 has a suspended insulator 5 shown in FIG. 1 connected in series. It is constructed by connecting many. This suspension insulator 5 is composed of an insulator body 6, a cap metal fitting 7 bonded with cement to its upper part, and a pin metal fitting 8 bonded with cement 1 to its lower part.

On the other hand, in a stable place on the ground G, a vibration laser generator 'A' is installed to give a mechanical shock to the suspension 48 r-5.
A pulse laser generator 11 is installed as ,(,”
By irradiating the porcelain surface 6a of the insulator body 6 with laser light, the suspended insulator 5 can be vibrated. In this embodiment, from the pulse laser generator 11, T'E
A CO2 laser (λ=106 μIn, output .about., several J) is outputted. When the surface of the insulator is irradiated with the T EACO2 laser beam emitted from the laser generator 11, the irradiated surface is heated in a pulsed manner to generate a shock wave, and this effect causes the insulator to vibrate.

Further, in the vicinity of the pulse laser generator 11, a He-Ne laser generator 12 is installed as a vibration detection laser generator for detecting the vibration of the insulator using laser interference. From this laser generator 12, (λ-0
．． A laser beam with a diameter of 64 μm and an output of several m W is output.

A beam splitter 13 is arranged in front of the laser generator 12 to split the laser beam emitted from the generator 12 into two. The laser light traveling straight from the beam splitter 13 is irradiated onto the suspension insulator 5, and then passes through the light glass 14 as object reflected light.
The light is input to a photodetector 15. (See the solid line in FIG. 1) On the other hand, the original laser beam (reference beam) split by the beam splitter 13 is caused to interfere with the object reflected light from the insulator due to the optical path difference. The light intensity of the reference light is much stronger than the light reflected from the object, so when the reference light and the light reflected from the object are superimposed, it is difficult to tell whether there is interference unless the light intensities are approximately the same. Therefore, after passing through the beam diffusing lens 16 to attenuate the light intensity, the beam passes straight through the slide glass 1/1 and filter 17 to attenuate the light intensity.
The light passes through the A1 mirror 18, is reflected by the A1 mirror 18, passes through the filter 17 again, is guided to the slide glass 14, and is reflected by the slide glass 14 to coincide with the object reflected light to generate interference light. The interference fringes of this interference light are detected by a photodetector 15 and converted into an electrical signal by a vibration detection device 19.

The photodetector 15 detects the movement of the interference fringes because when the suspended insulator is vibrated, the interference fringes also move. or,
The vibration detector 19 detects the vibration of the forceps from the movement of interference fringes detected by the photodetector 15. The reason for the movement of the interference fringes is that when the suspended insulator 5 is vibrated, the optical path difference between the reference light and the object reflected light changes. Since the distance between the bright parts of the interference fringes corresponds to one wavelength,
It is possible to reproduce the vibration of the insulator by counting the number of stripes that have moved. The minimum resolution of vibration displacement of one vibration detector using this movement of interference fringes is approximately 0.3 μIn.
This allows the extremely weak vibrations of the insulator to be measured from a remote point.

Furthermore, an audio conversion device 20 is connected to the vibration detector 19, and the voltage waveform I output from the vibration detector 19 is
It is possible to convert No. A into audible audio.

Next, the operation of the defective insulator detection apparatus constructed as described above will be explained with a focus on coachyard 71 in FIG. 3.

First, the porcelain surface 6a is irradiated with a vibration detection laser by the 1-r e-N e laser generator 12 and reflected by the porcelain surface 6a, and this '#J body reflected light is passed through the slide glass 14. let

On the other hand, the reference light split from the beam splitter 13 is attenuated by the beam diffusing lens 16, filter 17, etc.
The reference light is guided by the slide class 14 in the same direction as the object reflected light, and interference occurs between the object reflected light and the reference light, and this interference light is guided to the photodetector 15. Therefore, the photodetector 15 sees interference fringes caused by the object reflected light and the reference light.

Next, a laser beam is irradiated from the pulse laser generator 11 onto the ceramic surface 6a of the suspended insulator 5 to give a mechanical shock, thereby causing the suspended insulator 5 to vibrate. Then, the movement of the interference fringes is detected by the photodetector 15, and this movement is converted into a voltage waveform signal as shown in FIG.

Further, the voltage waveform signal is detected by the audio conversion device 20, and then converted into a vibration displacement signal by a frequency demodulation operation such as passing through a low-pass filter, as shown in FIG. You can hear the vibration sound directly. By comparing this vibration sound with the reproduced sound of a normal insulator, it is possible to reliably and easily determine whether the insulator is good or bad.

[Effects of the Invention] As detailed above, the present invention has the advantage that it is possible to reliably and quickly determine whether an insulator is a normal insulator or a defective insulator, and that it can be performed safely from a remote location even when the line is live. There is.

[Brief explanation of the drawing]

Fig. 1 is a front view of the road body showing the defective insulator detection device of the present invention, Fig. 2 is a front view of the road body showing the defective insulator detection device arranged near the steel tower, and Fig. 3 is the method for detecting defective insulators. FIG. 4 is a waveform diagram showing the voltage waveform signal output from the interference fringe detector, FIG. 5 is a waveform diagram showing the displacement conversion output signal, and FIGS. 6 and 7 are a normal insulator and a defective insulator. FIG. 3 is a voltage waveform diagram showing an output signal of FIG. 11... Valve laser generator, 12... He-Ne
Laser generator, 13... Beam splitter, 171.
...Slide glass, 15...Photodetector, 16...
Beam diffusion lens, 17...filter, 18...A
I mirror 19...vibration detector, 2o...sound conversion device. Patent Applicant Nippon Teiko Co., Ltd. Agent Patent Attorney Form of Amendment (Method) 1. Indication of the Case 1984 Patent Application No. 184825 Name of the Invention IM with the Person Who Corrects a Detection Device for Defective Insulators Case System: Patent applicant address 2-56 Suda-cho, Mizuho-ku, Nagoya Name
406 Nippon Insulator Co., Ltd. (Name) Representative
Sandai Ohara

Claims (1)

[Scope of Claims] 1. A laser generator for vibrating an insulator that mechanically vibrates the insulator by irradiating the surface of the insulator with a laser beam, and irradiating the insulator with a laser beam for detecting vibration on the surface of the insulator. A vibration detection laser generator and a laser beam irradiated from the vibration detection laser generator are reflected from the same insulator, and this reflected laser beam (object reflected light) is caused to interfere with the original laser beam, and from this interference light, the insulator is 1. A defective insulator detection device comprising: a vibration detection device for detecting vibration; and a voice conversion device for converting a detection signal output from the vibration detection device into an audible sound.